Note 13 - Stock-based Compensation - Share-based Compensation Expense (Details) - USD ($) $ in Thousands |
3 Months Ended | |
|---|---|---|
Mar. 31, 2025 |
Mar. 31, 2024 |
|
| Share-Based Payment Arrangement, Expense | $ 326 | $ 809 |
| Research and Development Expense [Member] | ||
| Share-Based Payment Arrangement, Expense | 141 | 328 |
| General and Administrative Expense [Member] | ||
| Share-Based Payment Arrangement, Expense | $ 186 | $ 481 |
| X | ||||||||||
- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. Reference 1: http://www.xbrl.org/2003/role/disclosureRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|